# RadioSahck 12v Power supply connect to Car Subwoofer **URL:** \ **Category:** General Discussion\ **Created:** [September 20, 2020, 4:33pm UTC](https://community.cartalk.com/t/radiosahck-12v-power-supply-connect-to-car-subwoofer/170189 "2020-09-20T16:33:23Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Eprosound](https://avatars.discourse-cdn.com/v4/letter/e/f9ae1b/32.png) [@Eprosound](https://community.cartalk.com/u/Eprosound)\ **Post date:** [September 20, 2020, 4:33pm UTC](https://community.cartalk.com/t/radiosahck-12v-power-supply-connect-to-car-subwoofer/170189/1 "2020-09-20T16:33:23Z")
I tried to hook this up, but I cannot get the amp to turn on Not sure what did I miss ![IMG_2351](https://global.discourse-cdn.com/cartalk/original/3X/e/1/e1f4f41c6056a2e8892bf125890ad0519f422139.jpeg) ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [September 20, 2020, 5:10pm UTC](https://community.cartalk.com/t/radiosahck-12v-power-supply-connect-to-car-subwoofer/170189/2 "2020-09-20T17:10:36Z")
Either pwr supply is bad? Amp is bad? All fuses are good? Your meter shows 12v at amp connector? Bad signal fron HU source? Where is blue 12v on lead from hu to amp? ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [September 20, 2020, 5:59pm UTC](https://community.cartalk.com/t/radiosahck-12v-power-supply-connect-to-car-subwoofer/170189/3 "2020-09-20T17:59:38Z")
You have the ground wire connected to the remote connector. Move the black wire to the GND connector. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [September 20, 2020, 6:44pm UTC](https://community.cartalk.com/t/radiosahck-12v-power-supply-connect-to-car-subwoofer/170189/4 "2020-09-20T18:44:05Z")
Switch the leads on the power supply as well. It looks like the red wire is attached to the negative, or ground, terminal and not the black wire. ---
**Author:** ![It\_s-Me](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/it_s-me/32/12660_2.png) [@It\_s-Me](https://community.cartalk.com/u/It_s-Me)\ **Post date:** [September 20, 2020, 9:03pm UTC](https://community.cartalk.com/t/radiosahck-12v-power-supply-connect-to-car-subwoofer/170189/5 "2020-09-20T21:03:50Z")
At the amp you need to connect the black wire to GND At the amp you also need a short wire to connect +12V to REM to each other And with a 40 Watt/1.? amp power supply, it’ not even close to being big enough to run your amp. ---
**Author:** ![Eprosound](https://avatars.discourse-cdn.com/v4/letter/e/f9ae1b/32.png) [@Eprosound](https://community.cartalk.com/u/Eprosound)\ **Post date:** [September 20, 2020, 10:33pm UTC](https://community.cartalk.com/t/radiosahck-12v-power-supply-connect-to-car-subwoofer/170189/6 "2020-09-20T22:33:19Z")
Got it! I think I need a bigger power supply ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [September 20, 2020, 10:51pm UTC](https://community.cartalk.com/t/radiosahck-12v-power-supply-connect-to-car-subwoofer/170189/7 "2020-09-20T22:51:21Z")
You got that right! It says 40W max, the amp says 500W max output. ---
**Author:** ![TwinTurbo](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@TwinTurbo](https://community.cartalk.com/u/TwinTurbo)\ **Post date:** [September 21, 2020, 2:21am UTC](https://community.cartalk.com/t/radiosahck-12v-power-supply-connect-to-car-subwoofer/170189/8 "2020-09-21T02:21:55Z")
500W is peak, only 300W rms. Read someone online had it tested- real world more like 175W. Supply is still underpowered but should run the amp/sub up until it’s limit is reached if wired correctly. Who did the crimps on the spade terminals? Insulation should be tucked inside and captured by the outer band of the crimp sleeve. The supply wire gauge looks on the smaller side as well.